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After medical or surgical this website castration, persistent, although not insignificant, low levels of androgens are produced from extragonadal sources such as the adrenal glands. Some CRPR acquire the ability to convert adrenal steroids to androgens, maintaining levels sufficient to activate androgen receptor. The inhibition of persistent androgen production and androgen receptor mediated signaling are relevant therapeutic strategies for mCRPC.33 Abiraterone acetate is a selective inhibitor of androgen biosynthesis that potently blocks cytochrome P450 c17 (CYP17). Phase II clinical trials with abiraterone acetate have yielded promising results,34,35 which have now been corroborated in a randomized, double-blind, placebo controlled phase III trial of abiraterone acetate plus low-dose prednisone in patients with mCRPC who had progressed after docetaxel-based chemotherapy.36 AZD4547 research buy The results from this phase III study demonstrate that patients treated with abiraterone acetate plus low-dose prednisone/prednisolone showed a significant improvement in overall survival compared to patients treated with prednisone/prednisolone plus placebo. After a median follow up of 12.8?months, overall survival was 14.8 versus 10.9?months; (HR?=?0.65; 95% CI: 0.54�C0.77; P?INPP5D androgen production, there is a compensatory rise in adrenocorticotropic hormone mediated by a hypothalamic response to partial adrenal inhibition. This can cause increased adrenal mineralocorticoid production, which can lead to hypertension and hypokalemia. In the phase III trial, mineralocorticoid-related adverse events were more common in the abiraterone acetate arm than in the placebo arm, including fluid retention (31 vs 22%) and hypokalemia (17 vs 8%). However, grade 3/4 hypokalemia (3 vs 1%), and grade 3/4 hypertension (1 vs 0.1%) were infrequent. As a result of a report of a grade 4 elevation in aminotransferase levels early in the study, frequent monitoring of liver function tests occurred during the first 12?weeks of treatment. Overall abnormal liver function tests occurred with similar frequency in the abiraterone and the placebo groups (all grades: 10 vs 8%). A similar trial in the pre-chemotherapy setting has completed accrual and is undergoing analysis.37Table?3 provides an overview of current phase III studies. Bone metastases are a substantial burden to men with advanced prostate cancer, causing considerable pain.